基于摆扫反射镜的大视场成像像移模型

Image Motion Model of Large Field of View Imaging Based on Swing Mirror [JZ)]

摘要:

为实现大视场技术指标,建立了一种基于摆镜转动的摆扫成像模型;通过对摆扫成像与推扫成像模式的比较,分析得出当横滚角等于摆镜转角的2倍时,摆扫成像能够实现与推扫成像小姿态时相同的视场；经过实验验证,在横滚角为2°、4°、6°、8°、10°时,文章的方法与推扫成像模型像移相对误差在1%以内,偏流角大小相对误差在0.001%以内,两种方法保持了较好的一致性,保证了模型的合理性与正确性;此外,该模型还可以通过实时地控制摆镜的转动来实现穿航方向上的对地的扫描成像,进而实现大视场、宽幅盖对地成像,减小回访周期,提高空间相机对地成像的工作效率。

Abstract:

To achieve the large field of view, it establishes the whiskbroom imaging model based on the rotating mirror.Comparing the whiskbroom and pushbroom models, it finds that when the roll angle is two times of the angle of the swing mirror, the pushbroom and whiskbroom has the same field of view. Through the experimental verification, at the small angle attitude 2°、4°、6°、8°、10°,the relative error of this model is within 1% and relative error of drift angle is within 0.001% of the pushbroom imaging model. Two ways have good consistency, ensuring the rationality and accuracy of the model. Besides, the model can scan imaging across the navigation direction by controlling the rotation of the swing mirror in real time to realize large field of view, wide swath of imaging, reducing the return period and improving the working efficiency of the space camera.